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Review questions

What are the human health hazards of vinyl chloride?

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What are the human toxicity values (RfD, CSF) of vinyl chloride and how are these values estimated?

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How do you calculate the dose received by children and adults via ingestion of vinyl chloride-contaminated drinking water under the RME scenario? Please document and explain your assumptions along with your references for the exposure parameters for each receptor of concern

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How do you calculate RME cancer and noncancer risks to children and adults for the above exposure scenario?

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What does excess cancer risk of three cases out of ten thousand exposed (3x10 -4 ) signify?

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If drinking water were also contaminated with benzene, how would you estimate cumulative cancer and noncancer risks associated with exposure to drinking water contaminated with vinyl chloride and benzene for children and adults under the RME scenario?

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References

Burmaster, D.E.&Harris, R.H. (1993). The magnitude of compounding conservatisms in Superfund risk assessments. Risk Analysis , 13 , 131-34.

EPA (U.S. Environmental Protection Agency). (1989). Risk assessment guidance for Superfund, volume I: Human health evaluation manual (Part A) (Interim Final) ( EPA/540/1-89002). Office of Emergency and Remedial Response, Washington, DC

EPA (U.S. Environmental Protection Agency). (1990, March 8). National contingency plan. Federal Register , 55 , 8848. Washington, DC.

EPA (U.S. Environmental Protection Agency). (1993, September). SI 400: Introduction to risk assessment and risk management for hazardous air pollutants. Air Pollution Training Institute. Environmental Research Center, Research Triangle Park, NC.

EPA (U.S. Environmental Protection Agency). (1997, August). Exposure factors handbook, volume I – General factors (EPA/600/P-95/002Fa). National Center for Environmental Assessment, Office of Research and Development, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2001, December). Risk assessment guidance for Superfund, volume III – Part A: Process for conducting probabilistic risk assessment (EPA540-R-02-002). Office of Emergency and Remedial Response, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2002a, December). Supplemental guidance for developing soil screening levels for Superfund sites (OSWER 9355.4-24). Office of Emergency and Remedial Response, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2002b, September). Child-specific exposure factors handbook (EPA-600-P-00-002B). Interim Report. National Center for Environmental Assessment, Office of Research and Development, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2003, December 5). Human health toxicity values in Superfund risk assessments (OSWER Directive 9285.7-53). Memorandum from Michael B. Cook, Director of Office of Superfund Remediation and Technology Innovation to Superfund National Policy Managers, Regions 1 – 10. Office of Emergency and Remedial Response, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2004a, July). Risk assessment guidance for Superfund, volume I: Human health evaluation manual (Part E, supplemental guidance for dermal risk assessment) (EPA/540/R/99/005). Final. Office of Superfund Remediation and Technology Innovation, Washington, DC.

EPA (U.S. Environmental Protection Agency). (2004b, April). ProUCL Version 3.00.02 user's guide and software (EPA/600/R04/079). Prepared by Anita Singh and Robert Maichle with Lockheed Martin Environmental Services and Ashok K. Singh of University of Nevada for the U.S. Environmental Protection Agency.

Erdal, S. (2007). Case study: Multi-pathway risk assessment for adults and children living near a hazardous waste site. In M.G. Robson&W.A. Toscano (Eds.), Environmental Health Risk Assessment for Public Health (pp. 523-530). Association of Schools of Public Health.

Lilienfeld A.M.&Lilienfeld, D.E. (1980). The French influence on the development of epidemiology. Henry E Sigerist Suppl Bull Hist Med , 4 , 28-42.

NAS (National Academy of Sciences). (1983). Risk assessment in the federal government: Managing the process . National Academy Press, Washington, DC.

Questions & Answers

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Step 1: Find the mean. To find the mean, add up all the scores, then divide them by the number of scores. ... Step 2: Find each score's deviation from the mean. ... Step 3: Square each deviation from the mean. ... Step 4: Find the sum of squares. ... Step 5: Divide the sum of squares by n – 1 or N.
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The sample of 16 students is taken. The average age in the sample was 22 years with astandard deviation of 6 years. Construct a 95% confidence interval for the age of the population.
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Bhartdarshan' is an internet-based travel agency wherein customer can see videos of the cities they plant to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400 a. what is the probability of getting more than 12,000 hits? b. what is the probability of getting fewer than 9,000 hits?
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Bhartdarshan'is an internet-based travel agency wherein customer can see videos of the cities they plan to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400. a. What is the probability of getting more than 12,000 hits
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Source:  OpenStax, Sustainability: a comprehensive foundation. OpenStax CNX. Nov 11, 2013 Download for free at http://legacy.cnx.org/content/col11325/1.43
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